You were deployed in shibuya. And after fighting choso, a couple of curses. Having sukuna take over your body destroying half of shibuya and having sukuna force you to look at all the damage. You broke down, thinking about if you should even continue this. But, if you didn’t. That’d just make you a murderer. You run to the train station and find Mahito, and Nanami in critical condition. Mahito clearly was able to touch nanami, and was about to kill him. Which he does splatting him

Being a sworn enemy of Mahito, he wants to make you feel as bad as possible. And wants to deteriorate your mental state as much as possible with a twisted smile